I'm building my first form 1 suppressor, and want to go to with 1.375x24 (Hub) threads. I'm finding conflicting info on the major and minor diameters. One source is showing 1.370 major and 1.335 minor, theoretical machinist is showing 1.372 major, but 1.319 minor. The major diameters are close enough, but the minors are .016 different...
Any input on which is accurate?
1.375x24 minor diameter?
Re: 1.375x24 minor diameter?
I would look up the spec in Machinist Handbook and use that. Or, buy your mount and use it as the gauge. It’s probably the safest bet.
FFL 07/02 SOT
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Re: 1.375x24 minor diameter?
Yes i would use the adapter/mount as a guide. You have no idea what the thread spec is on the mount. If you not making things to sell then its better to have a good fit rather than meeting a thread spec